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Inverse Analyses of Transport of Chlorinated Hydrocarbons Subject to Sequential Transformation Reactions

Francis X.M. Casey^*,a and Jií imnek^b

^a Dep. of Soil Science, North Dakota State Univ., Fargo, ND 58105
^b George E. Brown Jr. Salinity Lab., USDA-ARS, Riverside, CA 92507

View larger version (22K): [in a new window]   Fig. 1. Breakthrough curves from the column filled with iron filings (Fe column) for the fast, intermediate, and slow flow rates. Inverse model solutions to the equilibrium (Eq. [1a,b and 2]) and nonequilibrium (Eq. [2a,b and 3]) models are also plotted.

View larger version (22K): [in a new window]   Fig. 2. Breakthrough curves from the column filled with iron fillings coated with copper (Cu–Fe column) for the fast, intermediate, and slow flow rates. Inverse model solutions to the equilibrium (Eq. [1a,b and 2]) and nonequilibrium (Eq. [2a,b and 3]) models are also plotted.

View larger version (16K): [in a new window]   Fig. 3. A comparison of normalized degradation rates from this study to previous studies. The normalized degradation rates were obtained from curve fits using the (a) equilibrium and (b) nonequilibrium sorption models. Figure adapted from Tratnyek et al. (1997) and is reprinted by permission of Ground Water Monitoring & Remediation (Copyright 1997).